Avoid trusting the length encoded in the Snapshot if there is an

runtime/vm/port_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/assert.h"
 #include "vm/message_handler.h"
 #include "vm/os.h"
 #include "vm/port.h"
 #include "vm/unit_test.h"
 
@@ skipping 103 matching lines @@
   EXPECT(!PortMapTestPeer::IsActivePort(port));
   EXPECT(!PortMapTestPeer::IsLivePort(port));
 }
 
 
 TEST_CASE(PortMap_PostMessage) {
   PortTestMessageHandler handler;
   Dart_Port port = PortMap::CreatePort(&handler);
   EXPECT_EQ(0, handler.notify_count);
 
+  const char* message = "msg";
+  intptr_t message_len = strlen(message) + 1;
+
   EXPECT(PortMap::PostMessage(new Message(
-      port, 0, reinterpret_cast<uint8_t*>(strdup("msg")),
+      port, 0, reinterpret_cast<uint8_t*>(strdup(message)), message_len,
       Message::kNormalPriority)));
 
   // Check that the message notify callback was called.
   EXPECT_EQ(1, handler.notify_count);
   PortMap::ClosePorts(&handler);
 }
 
 
 TEST_CASE(PortMap_PostMessageInvalidPort) {
+  const char* message = "msg";
+  intptr_t message_len = strlen(message) + 1;
+
   EXPECT(!PortMap::PostMessage(new Message(
-      0, 0, reinterpret_cast<uint8_t*>(strdup("msg")),
+      0, 0, reinterpret_cast<uint8_t*>(strdup(message)), message_len,
       Message::kNormalPriority)));
 }
 
 }  // namespace dart